Re: Videographer As Crew
Technically, xort has it right. You are offering a commercial venture and the fact that it is for barter instead of for cash makes no difference. The owner is getting "paid" with your video, if they say to other strangers "you pay expenses" that is still a vessel for hire and a captain's license still needed.
Yes, many people ignore that, but when there's a formal agreement for compensation as opposed to a voluntary action between pre-existing friends? That's commercial.
Easy enough to ignore, unless something goes wrong someone gets sued, and then the technicalities rear their ugly heads. If you are injured on their boat, their insurer can also walk away. A little more risk, both ways.